Home / Standards / GB/T 3978-2008 GB/T 3978-2008 Active Standard illuminants and geometric conditions 标准照明体和几何条件 Standard Type GBT ICS 17.180.20 CCS K70 Status 现行 Issue Date 2008-06-26 Implementation 2009-03-01 Responsible Dept 国家标准委 Drafting Unit 国家标准委